Alphabeta Math
DefinitionDefinition: Literature-sourcedProof: AI-generatedPipeline-generatedjudge pass (gpt-6-luna)verified 2026-10-22 (gpt-6.1-sol)
How statement and proof provenance work

The first chip identifies the source of the statement or construction; the second identifies the source of its local proof or verification.

  • Literature-sourced: the exact statement appears in a cited source; only wording and notation differ.
  • AI-adapted: a semantically identical restatement of literature-sourced material, modulo indexing, notation, and boundary cases adopted by the library.
  • AI-generated: a genuinely novel statement formulated by AI, with no source for the claim itself.

These labels describe origin, not correctness: citations and verification chips remain separate evidence.

Embedded arc surgery on a spanning surface

Definition

Let F be a compact oriented embedded surface in the oriented 3-sphere. An embedded arc surgery on F is the following operation. Choose an embedded solid cylinder C=[0,1]×D2 whose intersection with F is exactly its two end disks {0,1}×D2, both contained in the interior of F, and whose interior approaches the same cooriented local side of F at both disks. Require the lateral annulus [0,1]×∂D2 to admit an orientation agreeing along both attaching circles with the orientation on the remaining part of F. Replace the two disks by that annulus, then round the two seams in disjoint neighbourhoods of the attaching circles to obtain a smooth embedded surface FC. The core [0,1]×{0} is the surgery arc. The operation preserves ∂F and its boundary orientation; its reverse is called an arc-surgery reduction.

twoenddisksonFtubereplacesdisks

The drawing is a side-view schematic: the two short boundary circles are the attaching circles, the blue arc depicts one boundary of the lateral annulus, and the cylinder interior is not part of the surface. The move is defined by the embedded product cylinder above, not by the sketch.

Depends on

Used by

Dependency tree · two levels

6 results within two dependency steps of this one, each drawn at its shortest distance from it. An arrow runs from a result to what uses it, so the chart reads left to right and ends at this result, which carries a heavier outline. Every node is a link to that result. Click elsewhere on the chart to enlarge it.

Sources